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The xc potentials for this plot were obtained from a MRCI calculation in a large basis set. The magnitude of the step in the response potential decreases if the distance between the 2 H2 units increases. There is no step in the exact vxc for two closed shell systems at infinite separation. For that case the LDA/GGA calculation gives the correct polarizability of twice the polarizability of a single H2 unit.

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